Gas pilot burner and draft shield



da.A q iles Aug. 1l, 1953 c. E. BODEY 2,648,377

GAS PILOT BURNER AND DRAFT SHIELD Filed oct. so; 1947A Bnventor Cttorneg Patented Aug. 11, 1953 UNITED STATES PATENT OFFICE GAS PILOT BURNER AND DRAFT SHIELD Charles E. Bedey, St. Paul, Minn., assignor to Minneapolis-Honeywell Regulator Company, Minneapolis, Minn., a corporation of Delaware 13 Claims.

This invention relates to improvements in gas burners and, more particularly. to improvements in gas burners adapted to heat a thermopile and to provide a pilot flame for an associated and Figure 3 is a side elevational view of a second modification of the burner; while Figure 4 is an elevational view of the burner of Figure 3.

larger burner. 5 Referring now to the modification shown in It has been found that it is highly desirable to Figures 1 and 2, the numeral Ill is used to genprovide draft shields on pilot burners to prevent erally designate the entire head. The main body strong drafts, usually present in a furnace, from portion II is of inverted cup-shape and may be extinguishing the small flame or flames proformed either by casting it in this shape or duced by the pilot burner. In burners of this axially boring out a length of round bar stock. type, the flame produced thereby for igniting the A diametrically extending recess I2 is formed in main or larger burner is often extinguished, due the outer surface of the closed end of the body -to the draft caused by sudden ignition of the II, either by casting said recess therein or by main burner. It is the purpose of the slot bemachining it therein. Diametrically opposed tween the burner orifices to provide ya runner I5 outlet apertures or openings I3 are preferably flame to carry a iiame from another flame to the formed by drilling through the walls of the body. extinguishing llame orice to reignite it. It is They are positioned inwardly from the closed end this runner or carrier flame in particular that of the body with their longitudinal common axis must be protected from drafts `so as to assure reparallel to the longitudinal axis of the recess I2. ignition of the plOt flame 00 prevent -an unsafe 20 A diametrically and axially extending groove I4 accumulation of fuel in the furnace before ignextends from the bottom of recess I2 to the cention. ters of apertures l 3. A hole I5 is bored or other- The prior art pilot burners, having draft wise formed in the side wall of the body II near shields thereon, are either machined out of heavy the open inlet end thereof. This hole is adapted stock or otherwise require expensive machining to be placed in alignment with a threaded hole and assembling operations thereon in their proin a burner fuel supply tube (not shown). Thus duction. Separation of the shield from the realigned, .a screw passing through opening I5 into mainder of the burner, of the prior art constructhe threaded hole of the burner fuel supply tube, tions for repairing or cleaning, is either imposwill fixedly secure the burner head I D on the sible or impractical. m fuel supply tube.

One of the objects of this invention is to pro- A yoke-like draft shield I6, of inverted vide a pilot burner head having a draft shield U-shape in side elevation and of U-shape in end and an orice member that are readily assembled elevation, is preferably formed out of flat sheet and disassembled either for repairing or for material. The draft shield is iirst stamped out cleaning. a of the sheet material to provide a substantially Another object of the invention is to provide rectangular piece having a substantially reca pilot burner head composed of separatable eletangular opening in the middle thereof. This ments of inexpensive construction and which piece is then bowed longitudinally to give it the may be easily assembled. above mentioned U-shape in end elevation with Another object of the invention is to provide n the inside radius of curvature of the base of the pilot burner parts which are so interlocked with U the same as, or only slightly larger than, the each other that each retains the other in its asradius of the aperture I3 in the wall of burner sembled position. II. The size and shape of the central aperture A still further object of the invention is to in the shield piece I6 is such that when the base provide a burner head consisting of detachable of the inverted U-shape portion thereof rests on parts of which at least one may be used in difthe bottom of recess I2, the base of the U-shape ferent modiiications of the burner head. portion of the shield surrounds the opening I3 Additional objects of the invention will bein the burner body I I. Notches I'I are formed in come apparent upon reading the following dethe outer end of the bases of the U-shaped portailed description of the invention in conjunctions iand diametrically opposite from the slot tion with the accompanying drawing wherein: I4, for a purpose to be hereinafter described.

Figure 1 isa side elevational View of one modi- A burner tip or orifice member I8 may be i'ication of the invention, showing a portion formed from iiat sheet material or tubular stock. thereof broken away; Preferably, it is formed by stamping out pieces Figure 2 is an end elevational view of the 55 from sheet material to provide a piece having burner shown in Figure l a large centrally disposed aperture therein and axially extending ears equal distance from the side edges thereof. The piece is then shaped to form a longitudinally-slotted tubular member having an outer diameter equal to or slightly less than that of the aperture I3 in the burner body I I. The slot 2 I, thus formed in the member I8, is of the same width as slot I4 in the burner body II. The ears 20 are substantially the same Width as the notches I1 in the shield I6.

To assemble the above mentioned three pieces of the burner head of this invention, it is only necessary for one to slide the yoke-like member or shield I6 downwardly over the recessed end of the burner body II until it rests on the bottom of the recess I2, then to slide the tip member I8 through the shield I6 and the openings I3 in the body II with the slot 2l in alignment With the slot I4 and the ears 20 in alignment with notches I'I, and then to bend the ears I l downwardly and into said notches I'I to thereby lock all of the parts in assembled relationship. v The burner head modification shown in Figures 3 and 4 is of the same general construction as that of Figures l and 2. It is generally designated by the reference numeral and has a main body portion 3I of inverted cup-shape. Instead of the end recess I2 of the modification of Figures 1 and 2, this modification has an annular groove 32 therein. The apertures 33, and hole 35 are the same as apertures I3 and hole I5 is in the burner head of Figures 1 and 2. The slot 34 is of the same width as slot I4 of the first modification but extends radially through the wall of the body 3l instead of axially therethrough asin the first modification.

The draft shield 36 is substantially the same as shield I6 of the first modification except that a kcentral aperture formed therein, in its flat stamped condition, is of more nearly oval shape than rectangular shape. This enables it to t closely against the bottomof the recess 32 when in its shaped condition and in its assembled position on the body 3 I. The recesses 3I in the shield 36 are for the same purpose as the recesses I'I in the rst modification.

The burner tip membei` 38 is identical to the tip member I 8 of the first modification, with the possible exception that the opening 39 may be of a different diameter than the opening I9 of the rst modification. However, it is preferable that the openings I9 and 39 be of the same size so that the burner tips may be interchangeable and only one size of tip need be produced for use in both modifications. The ears 40 and slot 4I are identical to the ears 20 and slot ZI of the rst modification.

The three parts of the second modification are assembled into a complete burner head in substantially the same manner as the burner head of the rst modification is assembled.

Operation,

When the burner head of either modification is secured to a burner supply tube and gas is permitted Vto iiow therethrough, the gas will pass outwardly through the burner body, through the centrally disposed aperture I9 or 39 in the burner tip member, out through both ends of the burner tip member and out through the aligned slots in the burner tip member and a wall of the burner body. When lighted, this burner head will produce two diametrically opposed primary or main ames connected by a runner flame and extending outwardly between the walls of the draft shield I6. One of these main flames is adapted to be used as a pilot flame for a much larger main burner associated therewith and the other fiame is adapted to be used to heat temperature responsive control means, well known in fuel burning arts, or the hot junction of a thermoelectric device, such as a thermopile. A thermopile, thus heated, is adapted to sufficiently energize a magnetic safety valve so as to hold it open. Flame failure causes deenergization of the thermopile and valve, thus providing safety shut-off of the fuel supply. Obviously, the shield on either burner modification will protect all three of said ames from normal drafts, and the runner flame in particular.

Should the burner head of either modification become damaged or clogged, it is readily apparent that the three elements forming the burner head could be quickly disassembled, by reversing the assembling steps, to remove and replace the damaged element, or to clean the elements. It could then be quickly and easily reassembled and put into operation.

As other modifications of this invention may be made without departing from the spirit thereof, it is to be understood that the scope of the invention is to be determined solely by the appended claims.

I claim as my invention:

1. A burner comprising a cup-shaped body having an open inlet end and a slot extending through a wall of said body at its closed end, said slot having enlarged openings at its ends, a yoke-shaped shield adjacent said slot and encompassing a portion of said body, and means in engagement with said body and said shield so as to retain said shield on said body.

2. A burner comprising a cup-shaped body having an open inlet end and a slot extending through a wall of said body at its closed end, said slot having enlarged openings at its ends, a yoke-shaped shield adjacent said slot and encompassing a portion of said body, and orifice means extending through said openings and in holding engagement with said shield.

3. A burner comprising a body member having open and closed ends, said member having a slot in a wall at its closed end, said slot having an enlarged opening at each of its ends, an orice member having a slot therein substantially in alignment with said slot in said wall and having spaced outlet openings therein adapted to provide spaced primary flames, said orifice member also having an inlet opening intermediate its ends and having the ends thereof extending through said openings, and means for releasably securing said members together so as to prevent relative movement therebetween.

4. A burner comprising a body member having an open end and a closed end, said closed end having a slot in the wall thereof, said slot having an enlarged opening at one of its ends, an orice member having a slot in alignment with said slot in the wall of said closed end and inlet and outlet openings therein, said orifice member removably extending through said opening, and draft shield means extending partially around said body adjacent said slot in said wall and partially around said orifice member.

5. A fuel burner comprising a cup-shaped body member having spaced openings adjacent its closed end, a slot in said body member connecting said openings, an orifice member extending through and beyond said openings, and a yokeshaped draft shield consisting of two parallel spaced U-shaped plates having legs joined across adjacent ends, said shield being so positioned externally of said cup-shaped body that the inner edges of the U-shaped plates encompass a portion of said body on opposite sides of said slot and the inner surfaces of the joined ends of the plates engage said orifice member.

6. A fuel burner comprising a cup-shaped body member having spaced openings adjacent its closed end, a slot in said body member connecting said openings, an orifice member extending through said openings, and a yoke-shaped draft shield consisting of two parallel spaced U-shaped plates having legs joined across adjacent ends, said shield being so positioned externally of said cup-shaped body that the inner edges of the U- shaped plates encompass a portion of said body on opposite sides of said slot and the inner surfaces of the joined ends of the plates engage said orifice member, and cooperating means on said shield and orifice member for locking them in their assembled position.

7. A burner comprising a body member having an open and a closed end, an axially extending slot in said closed end having an enlarged opening at one of its ends, an orifice member having a slot substantially in alignment with said slot in said closed end and inlet and outlet openings therein, said orifice member1 removably extending through said opening, and means for releasably securing said members together.

8. A burner comprising a cup-shaped body member having an open end and a transversely extending slot in its side Wall, said slot having an enlarged opening at one of its ends, an orifice member having a slot substantially in alignment with said slot in said wall and inlet and outlet openings therein, said orice member removably extending through said opening, and means for releasably securing said members together.

9. A burner comprising a cup-shaped body member having an open end and an axially extending slot in its closed end, said slot having an enlarged opening at one of its ends, an orifice member having a slot connecting with said slot in said end and inlet and outlet openings therein, said orifice member extending through said opening, and shield means extending partially around said body and said orifice member.

10. A burner comprising a cup-shaped body member having an open end and a transversely extending slot in its side wall, said slot having an enlarged opening at one of its ends, an orifice member having a slot connecting With said slot in said wall and inlet and outlet openings therein, said orifice member extending through said opening, and shield means extending partially around said body and said orifice member.

11. A fuel burner comprising a hollow body member having a side Wall and open and closed ends, a transversely extending slot in its side Wall that terminates at each end in spaced openings adjacent said closed end, an orifice member extending through said openings, and a yokeshaped shield consisting of two parallel spaced U-shaped plates having legs joined across the 6 ends of the adjacent parallel legs of said plates, said shield being so positioned that the inner edges of the U-shaped plates encompass a portion of said body and the inner surface of the joined ends of the legs engage said orifice member.

12. A burner comprising a body having an open and a closed end, an outlet opening in the closed end portion of said body, a horizontally extending orifice member having a passage therethrouugh and an outer end extending through and beyond said opening, said outer end having a fuel outlet communicating With said passage, a shield extending partially around said body and having a horizontally extending imperforate draft deflecting portion positioned below said orifice member and projecting from said body horizontally beyond the outer end of said orice member, the underside of said orifice member engaging said horizontally extending portion of said shield to maintain the latter in position on said body, and means on said orifice member for securing said orifice member against removal from said body to maintain said shield, orifice member, and body in assembled relationship.

13. A burner comprising a body having an open and a closed end, outlet openings in the closed end portion of said body, a horizontally extending orifice member having a passage therethrough and opposite outer ends extending through and beyond said openings, said outer ends each having a fuel outlet communicating with said passage, a shield extending partially around said body and having horizontally extending imperforate draft deflecting portions positioned below said orifice member and projecting from said body horizontally beyond the outer ends of said orifice member, the underside of said orifice member engaging said horizontally extending portions of said shield to maintain the latter in position on said body, and means on the outer ends of said orifice member for securing said orice member against removal from said body to maintain said shield, orifice member, and body in assembled relationship.

CHARLES E. BODEY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 21,053 Randall July 27, 1858 89,456 Allen Apr. 27, 1869 622,245 Luttrell Apr. 4, 1899 709,356 Piper Sept. 16, 1902 1,433,255 Binks Oct. 24, 1922 1,654,265 Leins Dec. 27, 1927 2,111,369 Marvin et al. Mar. 15, 1938 2,235,635 Herman Mar. 18, 1941 2,511,205 Harper June 13, 1950 FOREIGN PATENTS Number Country Date 305,396 Germany May 4, 1918 

